带有照片拍摄意图的Android FileProvider给出了java.io.IOException:写入失败:EPI

Question

我在使用新的FileProvider API时遇到问题：

我有以下代码从文件生成 uri：

public Uri generateUri(String authority) {
            File storageDir = context.getExternalFilesDir(Environment.DIRECTORY_PICTURES);
            File imageFile = fileHelper.from(storageDir, PHOTO_NAME);
            if (!imageFile.exists() && !imageFile.createNewFile()) {
                throw new Exception("Can't create capture file");
            }
            Uri sharedUri = ExtendedFileProvider.getUriForFile(context, authority, imageFile);
            return sharedUri;
    }

URI 是正确的，现在我打开这样的相机意图>

Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if (takePictureIntent.resolveActivity(context.getPackageManager()) != null) {
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, result);
                context.grantUriPermission(context.getPackageName(), result,
                        Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
                context.startActivityForResult(takePictureIntent, BaseActivity.SUBACTIVITY_TAKE_PHOTO);
            }

然后，相机打开，当照片拍摄并确认时，我有：

01-10 15:37:27.236 W/FastPrintWriter: Write failure
                                      java.io.IOException: write failed: EPIPE (Broken pipe)
                                          at libcore.io.IoBridge.write(IoBridge.java:501)
                                          at java.io.FileOutputStream.write(FileOutputStream.java:316)
                                          at com.android.internal.util.FastPrintWriter.flushBytesLocked(FastPrintWriter.java:336)
                                          at com.android.internal.util.FastPrintWriter.flushLocked(FastPrintWriter.java:359)
                                          at com.android.internal.util.FastPrintWriter.flush(FastPrintWriter.java:394)
                                          at android.view.ThreadedRenderer.dumpGfxInfo(ThreadedRenderer.java:613)
                                          at android.view.WindowManagerGlobal.dumpGfxInfo(WindowManagerGlobal.java:556)
                                          at android.app.ActivityThread$ApplicationThread.dumpGfxInfo(ActivityThread.java:1175)
                                          at android.app.ApplicationThreadNative.onTransact(ApplicationThreadNative.java:577)
                                          at android.os.Binder.execTransact(Binder.java:565)
                                       Caused by: android.system.ErrnoException: write failed: EPIPE (Broken pipe)
                                          at libcore.io.Posix.writeBytes(Native Method)
                                          at libcore.io.Posix.write(Posix.java:273)
                                          at libcore.io.BlockGuardOs.write(BlockGuardOs.java:319)
                                          at libcore.io.IoBridge.write(IoBridge.java:496)
                                          at java.io.FileOutputStream.write(FileOutputStream.java:316) 
                                          at com.android.internal.util.FastPrintWriter.flushBytesLocked(FastPrintWriter.java:336) 
                                          at com.android.internal.util.FastPrintWriter.flushLocked(FastPrintWriter.java:359) 
                                          at com.android.internal.util.FastPrintWriter.flush(FastPrintWriter.java:394) 
                                          at android.view.ThreadedRenderer.dumpGfxInfo(ThreadedRenderer.java:613) 
                                          at android.view.WindowManagerGlobal.dumpGfxInfo(WindowManagerGlobal.java:556) 
                                          at android.app.ActivityThread$ApplicationThread.dumpGfxInfo(ActivityThread.java:1175) 
                                          at android.app.ApplicationThreadNative.onTransact(ApplicationThreadNative.java:577) 
                                          at android.os.Binder.execTransact(Binder.java:565)

 

我已经完成了使用 FileProvider 所需的所有清单更改，并且一周前它正在工作。知道吗？

Answer 1

context.grantUriPermission(context.getPackageName(), result,
                    Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

此代码表示"授予我自己的应用使用我自己的应用数据的权限"。这不是你想要的。如果要使用 grantUriPermission() ，包名称需要是要向其授予权限的应用的名称。

此外，在较新的 API 级别上还有更简单的选项：

i.putExtra(MediaStore.EXTRA_OUTPUT, outputUri);
if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.LOLLIPOP) {
  i.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
}
else if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.JELLY_BEAN) {
  ClipData clip=
    ClipData.newUri(getContentResolver(), "A photo", outputUri);
  i.setClipData(clip);
  i.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
}
else {
  List<ResolveInfo> resInfoList=
    getPackageManager()
      .queryIntentActivities(i, PackageManager.MATCH_DEFAULT_ONLY);
  for (ResolveInfo resolveInfo : resInfoList) {
    String packageName = resolveInfo.activityInfo.packageName;
    grantUriPermission(packageName, outputUri,
      Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
  }
}

在这里，我：

• 只需使用 addFlags() ，如果应用程序在 Android 5.0+ 上运行

• 如果应用在 Android 4.1-4.4 上运行，请使用 ClipData

• 在 Android 4.0 及更早版本上遍历所有可能的相机应用，并为每个应用授予权限

我将在这篇博文中详细介绍该代码片段。